.sh-header{position:-webkit-sticky;position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid #e6e8ef;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,Hiragino Kaku Gothic ProN,Yu Gothic UI,Noto Sans JP,sans-serif}.sh-inner{max-width:1080px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}.sh-brand{display:inline-flex;align-items:center;gap:9px;text-decoration:none}.sh-logo{height:30px;width:auto;display:block;flex:0 0 auto}.sh-name{font-weight:700;font-size:19px;color:#1a2e6b;letter-spacing:.01em;white-space:nowrap}.sh-nav{font-size:15px;font-weight:500}.sh-links,.sh-nav{display:flex;align-items:center;gap:24px}.sh-links a{position:relative;color:#5b6473;text-decoration:none;padding:4px 2px;transition:color .15s ease}.sh-links a:after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;border-radius:2px;background:#1a2e6b;transform:scaleX(0);transform-origin:left;transition:transform .18s ease}.sh-links a:focus-visible,.sh-links a:hover{color:#1a2e6b;outline:none}.sh-links a:focus-visible:after,.sh-links a:hover:after{transform:scaleX(1)}.sh-login{background:#1a2e6b;color:#fff!important;padding:9px 18px;border-radius:999px;font-weight:600;text-decoration:none;box-shadow:0 2px 8px rgba(26,46,107,.22);transition:background .15s ease,transform .1s ease,box-shadow .15s ease}.sh-login:hover{background:#2a3f86;transform:translateY(-1px);box-shadow:0 6px 16px rgba(26,46,107,.28)}.sh-login:focus-visible{outline:2px solid #1a2e6b;outline-offset:2px}@media (max-width:680px){.sh-links{display:none}}